This is the most reliable method for handling Japanese character encoding directly. Open Command Prompt or Terminal.
When extracting, you likely see file names appearing as ? , テスト , or other junk characters. This is because your system is interpreting the Shift-JIS encoding as standard Unicode (UTF-8) or ASCII. 2. Solutions for Extraction Method A: Using 7-Zip Command Line (Recommended)
A file containing Japanese characters often results in garbled file names (mojibake) when extracted on a system not set to Japanese locale. This happens because the archive likely uses an old non-Unicode character encoding (like Shift-JIS/Code Page 932) to store filenames. Japanese.7z
Here is a complete write-up to handle, fix, and extract Japanese.7z files properly. 1. Identifying the Issue
Modern 7-Zip fully supports Unicode, but if the archive was created with an old tool using SJIS, it needs special handling. This is the most reliable method for handling
If you need to extract many such files, temporarily change your Windows system locale to Japanese. Go to > Clock and Region > Region . Click the Administrative tab. Click Change system locale... and select Japanese (Japan) .
Version 19 and later have improved handling of Japanese half-width kana, reducing the occurrence of garbled text. , テスト , or other junk characters
Use the -mcp switch with Code Page 932 (Japanese) to extract: 7z x "YourFile.7z" -mcp=932